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Summary Of Significant Accounting Policies (Reconciliation Of The Numerator And Denominator Used In The Calculation Of Basic And Diluted Net Income Per Share) (Details) (USD $)
In Thousands
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Net income attributable to Gilead$ 741,124$ 704,876$ 2,138,492$ 2,271,838
Weighted-average shares of common stock outstanding used in the calculation of basic net income per share attributable to Gilead common stockholders767,033833,006787,272871,887
Effect of dilutive securities, stock options and equivalents13,54814,22214,45217,120
Weighted-average shares of common stock outstanding used in the calculation of diluted net income per share attributable to Gilead common stockholders781,312847,228802,762890,216
2011 Convertible Senior Notes [Member]
    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Effect of dilutive securities, conversion spread  253461
2013 Convertible Senior Notes [Member]
    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Effect of dilutive securities, conversion spread731 785748